521026 has 12 divisors (see below), whose sum is σ = 859446. Its totient is φ = 236720.

The previous prime is 521023. The next prime is 521039. The reversal of 521026 is 620125.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 511225 + 9801 = 715^2 + 99^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (521021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 835 + ... + 1318.

2⁵²¹⁰²⁶ is an apocalyptic number.

521026 is a deficient number, since it is larger than the sum of its proper divisors (338420).

521026 is a wasteful number, since it uses less digits than its factorization.

521026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2177 (or 2166 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 521026 is about 721.8213075270. The cubic root of 521026 is about 80.4673684339.

Subtracting 521026 from its reverse (620125), we obtain a palindrome (99099).

It can be divided in two parts, 5210 and 26, that multiplied together give a triangular number (135460 = T₅₂₀).

The spelling of 521026 in words is "five hundred twenty-one thousand, twenty-six".